新叶尔加瓦是拉脱维亚的城镇，位于该国南部的道加瓦河左岸，面积6.1平方公里，2011年人口2,229。第二次世界大战期间，纳粹德国在1941年8月2日杀害当地犹太人居民。

Jaunjelgava ( pronunciation  German:Friedrichstadt) is a town in Latvia on the left bank of the Daugava River about 80 km southeast of Riga.

It was a fortress in Selonia which was levelled in the 13th century by Crusaders. A country estate and a settlement were formed around 1450. In 1590 Duke Friedrich Kettler founded the town market. At that time about 60 families lived at the market. The town was devastated in 1621, during the Polish-Swedish war, and was re-established as a city in 1646. In 1710 the plague, and 1831 and 1848 cholera, raged. In addition, there were several large fires in the town. Nevertheless, the town grew and was the district seat from 1795 on. After the opening of the Riga-Daugavpils railway line in 1861, the Daugava River waterway, and thus the city, lost its importance.